1. The frequency of a sound from your mouth is 250 Hz. a) Calculate the wavelength of this sound (use
Table 1 to find the speed).

b) Explain why sound is diffracted when it leaves
your mouth.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?